Soul means music with “soul”. Rhythm & Blues, born out of black blues, gave birth to soul music and rock and roll. Rhythm & Blues began to evolve into gospel-based soul music in the 1960s when the stench before that was somewhat weakened.
Soul, soul music is music developed from the 1950s to the early 1960s. Over time, the style of rhythm and blues that has evolved over a wide area has come to be called soul music.
Relatedly, Rhythm & Blues (R & B) in New York, black music of the 1940s. It began with jazz, blues, and gospel and evolved into popular music for the masses.